| 年度 | 实际值 |
|---|---|
| 1993 | 3.2 |
| 1994 | |
| 1995 | 0 |
| 1996 | 42.4 |
| 1997 | 42.7 |
| 1998 | 42.9 |
| 1999 | 42.9 |
| 2000 | 43.8 |
| 2001 | 2.98 |
| 2002 | |
| 2003 | 42.95 |
| 2004 | 36.81 |
| 2005 | 45 |
| 2006 | 48.1 |
| 2007 | 49.15 |
| 2008 | 48.58 |
| 2009 | |
| 2010 | 49.81 |
| 2011 | 48.06 |
| 2012 | 46.81 |
| 2013 | 45.95 |
| 2014 | 46.49 |
| 2015 | 47.26 |
| 2016 | 46.97 |
| 2017 | 45.8 |
| 2018 | 47.15 |